Extensive empirical literature consistently demonstrates that vehicular emissions significantly degrade urban air quality by increasing concentrations of particulate matter and toxic pollutants, which in turn drive a higher prevalence of respiratory illnesses and hospitalizations.
The claim posits that vehicular pollution significantly contributes to urban air quality degradation and respiratory illness. Multiple peer-reviewed studies across various geographical contexts (Nigeria, Ecuador, New Zealand, Indonesia, Thailand, the United States) and experimental settings provide robust, convergent evidence supporting both links. Consequently, the balance of evidence strongly favors the claim.